gdb/hppa-hpux-nat.c

   1 /* Native-dependent code for PA-RISC HP-UX.
   2
   3    Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include "gdb_assert.h"
  26 #include <sys/ptrace.h>
  27 #include <machine/save_state.h>
  28
  29 #ifdef HAVE_TTRACE
  30 #include <sys/ttrace.h>
  31 #endif
  32
  33 #include "hppa-tdep.h"
  34 #include "inf-ptrace.h"
  35 #include "inf-ttrace.h"
  36
  37 /* Non-zero if we should pretend not to be a runnable target.  */
  38 int child_suppress_run = 0;
  39
  40 /* Return the offset of register REGNUM within `struct save_state'.
  41    The offset returns depends on the flags in the "flags" register and
  42    the register size (32-bit or 64-bit).  These are taken from
  43    REGCACHE.  */
  44
  45 LONGEST
  46 hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
  47 {
  48   LONGEST offset;
  49
  50   if (regnum == HPPA_FLAGS_REGNUM)
  51     return ssoff (ss_flags);
  52
  53   if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
  54     {
  55       struct gdbarch *arch = get_regcache_arch (regcache);
  56       size_t size = register_size (arch, HPPA_R1_REGNUM);
  57       ULONGEST flags;
  58
  59       gdb_assert (size == 4 || size == 8);
  60
  61       regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
  62       if (flags & SS_WIDEREGS)
  63         offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
  64       else
  65         offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
  66     }
  67   else
  68     {
  69       struct gdbarch *arch = get_regcache_arch (regcache);
  70       size_t size = register_size (arch, HPPA_FP0_REGNUM);
  71
  72       gdb_assert (size == 4 || size == 8);
  73       gdb_assert (regnum >= HPPA_FP0_REGNUM);
  74       offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
  75     }
  76
  77   gdb_assert (offset < sizeof (save_state_t));
  78   return offset;
  79 }
  80
  81 /* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
  82    at all.  */
  83 #ifndef PTRACE_TYPE_RET
  84 #define PTRACE_TYPE_RET void
  85 #endif
  86
  87 static void
  88 hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
  89 {
  90   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  91   CORE_ADDR addr;
  92   size_t size;
  93   PTRACE_TYPE_RET *buf;
  94   pid_t pid;
  95   int i;
  96
  97   pid = ptid_get_pid (inferior_ptid);
  98
  99   /* This isn't really an address, but ptrace thinks of it as one.  */
 100   addr = hppa_hpux_save_state_offset (regcache, regnum);
 101   size = register_size (gdbarch, regnum);
 102
 103   gdb_assert (size == 4 || size == 8);
 104   buf = alloca (size);
 105
 106 #ifdef HAVE_TTRACE
 107   {
 108     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 109
 110     if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 111       error (_("Couldn't read register %s (#%d): %s"),
 112              gdbarch_register_name (gdbarch, regnum),
 113              regnum, safe_strerror (errno));
 114   }
 115 #else
 116   {
 117     int i;
 118
 119     /* Read the register contents from the inferior a chuck at the time.  */
 120     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 121       {
 122         errno = 0;
 123         buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
 124         if (errno != 0)
 125           error (_("Couldn't read register %s (#%d): %s"),
 126                  gdbarch_register_name (gdbarch, regnum),
 127                  regnum, safe_strerror (errno));
 128
 129         addr += sizeof (PTRACE_TYPE_RET);
 130       }
 131   }
 132 #endif
 133
 134   /* Take care with the "flags" register.  It's stored as an `int' in
 135      `struct save_state', even for 64-bit code.  */
 136   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 137     {
 138       ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 4);
 139       store_unsigned_integer ((gdb_byte *)buf, 8, flags);
 140     }
 141
 142   regcache_raw_supply (regcache, regnum, buf);
 143 }
 144
 145 static void
 146 hppa_hpux_fetch_inferior_registers (struct regcache *regcache, int regnum)
 147 {
 148   if (regnum == -1)
 149     for (regnum = 0;
 150          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 151          regnum++)
 152       hppa_hpux_fetch_register (regcache, regnum);
 153   else
 154     hppa_hpux_fetch_register (regcache, regnum);
 155 }
 156
 157 /* Store register REGNUM into the inferior.  */
 158
 159 static void
 160 hppa_hpux_store_register (struct regcache *regcache, int regnum)
 161 {
 162   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 163   CORE_ADDR addr;
 164   size_t size;
 165   PTRACE_TYPE_RET *buf;
 166   pid_t pid;
 167
 168   pid = ptid_get_pid (inferior_ptid);
 169
 170   /* This isn't really an address, but ptrace thinks of it as one.  */
 171   addr = hppa_hpux_save_state_offset (regcache, regnum);
 172   size = register_size (gdbarch, regnum);
 173
 174   gdb_assert (size == 4 || size == 8);
 175   buf = alloca (size);
 176
 177   regcache_raw_collect (regcache, regnum, buf);
 178
 179   /* Take care with the "flags" register.  It's stored as an `int' in
 180      `struct save_state', even for 64-bit code.  */
 181   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 182     {
 183       ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 8);
 184       store_unsigned_integer ((gdb_byte *)buf, 4, flags);
 185       size = 4;
 186     }
 187
 188 #ifdef HAVE_TTRACE
 189   {
 190     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 191
 192     if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 193       error (_("Couldn't write register %s (#%d): %s"),
 194              gdbarch_register_name (gdbarch, regnum),
 195              regnum, safe_strerror (errno));
 196   }
 197 #else
 198   {
 199     int i;
 200
 201     /* Write the register contents into the inferior a chunk at the time.  */
 202     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 203       {
 204         errno = 0;
 205         ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
 206         if (errno != 0)
 207           error (_("Couldn't write register %s (#%d): %s"),
 208                  gdbarch_register_name (gdbarch, regnum),
 209                  regnum, safe_strerror (errno));
 210
 211         addr += sizeof (PTRACE_TYPE_RET);
 212       }
 213   }
 214 #endif
 215 }
 216
 217 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 218    this for all registers (including the floating point registers).  */
 219
 220 static void
 221 hppa_hpux_store_inferior_registers (struct regcache *regcache, int regnum)
 222 {
 223   if (regnum == -1)
 224     for (regnum = 0;
 225          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 226          regnum++)
 227       hppa_hpux_store_register (regcache, regnum);
 228   else
 229     hppa_hpux_store_register (regcache, regnum);
 230 }
 231
 232 static int
 233 hppa_hpux_child_can_run (void)
 234 {
 235   /* This variable is controlled by modules that layer their own
 236      process structure atop that provided here.  The code in
 237      hpux-thread.c does this to support the HP-UX user-mode DCE
 238      threads.  */
 239   return !child_suppress_run;
 240 }
 241 \f
 242
 243 /* Prevent warning from -Wmissing-prototypes.  */
 244 void _initialize_hppa_hpux_nat (void);
 245
 246 void
 247 _initialize_hppa_hpux_nat (void)
 248 {
 249   struct target_ops *t;
 250
 251 #ifdef HAVE_TTRACE
 252   t = inf_ttrace_target ();
 253 #else
 254   t = inf_ptrace_target ();
 255 #endif
 256
 257   t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
 258   t->to_store_registers = hppa_hpux_store_inferior_registers;
 259   t->to_can_run = hppa_hpux_child_can_run;
 260
 261   add_target (t);
 262 }